Sheet conveying apparatus for image information processor

ABSTRACT

A paper sheet conveying apparatus and method for an image information processor in which a paper sheet with image information recorded thereon can be prevented from a skew carriage. The paper sheet conveying apparatus includes a driving motor which is controlled to be shifted from a forward revolution mode to a reverse revolution mode or vice versa. The paper conveying apparatus further includes a power cleaving means that selectively supplies the power to a first power transmitting system and to a second power transmitting system.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an image information processor such asa facsimile, copy machine and the like and method for using the same.More specifically, the present invention relates to a paper sheetconveying apparatus for an image information processor, which iscontrolled to prevent a paper sheet with image information recordedthereon from a skew carriage.

2. Description of the Related Art

For example, in image information processors, such as facsimiles, copymachines, printers and the like, there is a paper sheet conveyingapparatus for conveying a paper sheet (with image information recordedthereon) to an image reading part. This paper sheet conveying apparatushas the function of correcting a skew advancement of the paper sheet byarranging a leading end of the paper sheet.

The paper sheet conveying apparatus that has the function of correctinga skew advancement of the paper sheet is disclosed in U.S. Pat. No.5,749,570 and is schematically illustrated in FIG. 1.

Referring to FIG. 1, a conventional paper sheet conveying apparatus ofan image information processor includes a paper sheet separating roller11 and a paper sheet guide 12 installed above and below respectively,for separating one paper sheet from a plurality of stacked paper sheetsand conveying it to an image reading part 5, and a white roller 21installed opposite to the image reading part 5, for reading the imageinformation on the paper sheet.

As shown in FIG. 1, the image reading part 5, which is upwardly biasedby a spring to closely contact the white roller 21, reads the imageinformation of the paper sheet by an image reading sensor (notillustrated) into analogue signals, converts the analogue signals intodigital signals, and outputs the digital signals.

A reference numeral 6 indicates a paper presence sensor for sensing thepresence or absence of the paper in a paper stack pad 4. A referencenumeral 7 indicates a paper leading edge sensor for sensing the leadingedge of the advancing paper sheet and outputting the sensed information.

The paper leading edge sensor 7 outputs one set of control signals formatching the image reading starting point to the image reading startingtime for the image reading part 5, and another set of control signalsfor shifting the revolutions of a driving motor from the forwarddirection to the reverse direction or vice versa, thus for correlativelydriving the paper sheet separating roller 11 and the white roller 21.

As shown in detail in U.S. Pat. No. 5,749,570, the paper sheet conveyingapparatus as described above arranges the leading edge of the paper andcorrects the skew advancement by shifting the revolution direction ofthe driving motor and by using a mechanical timer mechanism.

Accordingly, the conventional paper sheet conveying apparatus of theimage information processor is very complicated in its constitution, andhas to be improved in its precision. Also, since the white roller 21 ismomentarily stopped and driven by the mentioned system to correct theskew carriage of the paper, a precision control is not guaranteed,particularly when high speed feeding is carried out.

Further, in the conventional paper sheet conveying apparatus, a separatepaper-ejecting roller cannot be easily installed in view of itsconstitution. That is, in the case where a paper ejecting roller isinstalled, the paper ejecting roller revolves in the reverse directionduring the reverse revolution of the driving motor, and therefore, thepaper sheet moves in the reverse direction, with the result that theejection of the paper sheet becomes impossible.

Accordingly, in the conventional paper sheet conveying apparatus, thepaper-ejecting roller is excluded, and therefore, high-speed paperejection becomes impossible, with the result that the image informationprocessing is limited in its speed and capacity.

SUMMARY OF THE INVENTION

The present invention is intended to overcome the above-describeddisadvantages of the conventional technique.

An aspect of the present invention is to provide a paper sheet conveyingapparatus of an image information processor and method, in which thecorrection precision for the skew advancement of the paper sheet isimproved.

Another aspect of the present invention is to provide a paper sheetconveying apparatus of an image information processor, in which theconveying-driving units are driven interactively and selectively by asingle driving source, thereby improving the paper sheet ejectionefficiency suitably for a large capacity paper sheet conveyingapparatus.

In achieving the above aspects, the paper sheet conveying apparatus ofan image information processor according to the present inventionincludes a driving unit which interactively and selectively drives apaper sheet separating roller, a paper sheet aligning roller and a papersheet ejecting roller at different conveying stages, the paper sheetseparating roller, the paper sheet aligning roller and the paper sheetejecting roller are sequentially disposed for uni-directionallyconveying an image-recorded paper sheet.

Further, the driving unit includes a driving motor which ismode-shiftably driven in a forward mode direction and a reverse modedirection, a power cleaving mechanism for selecting a rotational drivingforce in a certain direction to transmit the driving force throughdifferent paths in accordance with the driving modes, a first powertransmitting system which drives the paper sheet separating roller andthe paper sheet ejecting roller correspondingly with a conveyingdirection by being selectively connected to the power cleavingmechanism; and a second power transmitting system which drives the papersheet separating roller, the paper sheet aligning roller and the papersheet ejecting roller in the conveying direction by being selectivelyconnected to the power cleaving mechanism.

The power cleaving mechanism includes a main gear connected to an outputshaft of the driving motor, and first and second cam gears respectivelyinstalled on both ends of the output shaft of the main gear to be movedin a linear direction, for advancing and withdrawing mutually along anaxis of the main gear in accordance with the forward and reverse modedirections of the driving motor.

The first power transmitting system includes a first connection gearwhich is selectively connected in accordance with the straight movementsof the first cam gear, and a first passive gear installed on a shaft ofthe paper sheet separating roller and a second passive gear installed ona shaft of the paper sheet ejecting roller so that the first and secondpassive gears are connected to the first connection gear.

The second power transmitting system includes a second connection gearwhich is selectively connected to the second cam gear, a connecting gearinstalled on a shaft of the paper sheet aligning roller, for beingconnected to the second connection gear, and a power transmitting meansfor selectively connecting the passive gear of the paper sheet ejectingroller.

The invention further provides for a paper sheet conveying apparatus ofan image information processor, comprising means for interactively andselectively driving a paper sheet separating roller, a paper sheetaligning roller and a paper sheet ejecting roller at different conveyingstages, the paper sheet separating roller, the paper sheet aligningroller and the paper sheet ejecting roller being sequentially disposedfor uni-directionally conveying a paper sheet having a recorded image.The means for interactively and selectively driving includes a drivingmotor for being mode-shiftably driven in forward and reverse modedirections; and a power cleaving means for selecting a direction of arotational driving force to transmit the driving force through differentpaths in accordance with driving modes. The means for interactively andselectively driving further includes means for driving the paper sheetseparating roller and the paper sheet ejecting roller correspondinglywith a conveying direction by being selectively connected to the powercleaving means when the driving motor is driven in one of the forwardand reverse mode directions. Also included is a means for driving thepaper sheet separating roller, the paper sheet aligning roller and thepaper sheet ejecting roller in the conveying direction by beingselectively connected to the power cleaving means when the driving motoris driven in another of the one of the forward and reverse modedirections.

The invention even further provides for a method for conveying a papersheet in an image information processor, the image information processorhaving a paper sheet separating roller, a paper sheet aligning rollerand a paper sheet ejecting roller. The method comprises feeding a papersheet toward the aligning roller; and providing, selectively, arotational driving force by a driving motor in a forward revolution tothe paper sheet separating roller and to the paper sheet ejectingroller, wherein the paper sheet aligning roller is not provided with therotational driving force and is not rotating. The method furtherincludes conveying the paper sheet into the non-rotating aligning rollerand a non-rotating back-up roller, which faces the aligning roller, fora predetermined amount of time; and shifting the driving motor to areverse revolution so as to provide a rotational driving force, afterthe predetermined time has expired, to the paper sheet separatingroller, the paper sheet aligning roller and the paper sheet ejectingroller, so that the paper sheet is conveyed to an image reading portion.

BRIEF DESCRIPTION OF THE DRAWINGS

The above aspects and other advantages of the present invention willbecome more apparent by describing in detail the preferred embodimentsof the present invention with reference to the attached drawings inwhich:

FIG. 1 schematically illustrates the constitution of the conventionalpaper sheet conveying apparatus of the image information processor;

FIG. 2 schematically illustrates the constitution of the paper sheetconveying apparatus of the image information processor according to thepresent invention;

FIG. 3 is a perspective view of the driving unit that is installed inthe paper sheet conveying apparatus of the image information processoraccording to the present invention;

FIG. 4 schematically illustrates the critical portion of the drivingunit of FIG. 3;

FIG. 5 is a schematic perspective view showing the driving unitaccording to another embodiment of the present invention;

FIGS. 6 through 16 schematically illustrate the operation of the papersheet conveying apparatus of the image information processor accordingto the present invention; and

FIG. 17 is a time chart showing the operation control relations betweenthe major constituents of the paper sheet conveying apparatus of theimage information processor according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The paper sheet conveying apparatus and method of the image informationprocessor according to the present invention will be described in detailby referring to the attached drawings.

Referring to FIG. 2, the paper sheet conveying apparatus of an imageinformation processor according to the present invention includes apaper sheet feeding unit 110 for picking up paper sheets 101 of a papersheet stack pad 100 to convey them to an image reading part 105, a papersheet aligning unit 120 for restricting and aligning the leading edgesof the paper sheets conveyed from the image reading part 105, a papersheet ejecting unit 130 for ejecting the paper sheets downstream of theimage reading part 105 after the reading of the images, and a drivingunit 190 for controlling the driving of the respective units.

The paper feeding unit 110 includes a paper sheet feeding roller 111, apaper sheet separating roller 113, a paper pressing member 112, and apaper sheet separating guide 114, the two latter elements 112 and 114respectively face upper portions of the former two elements 111 and 113.

The paper sheet feeding roller 111 is driven passively by the papersheet separating roller 113 so as to transmit a rotating force to thelowermost one of the paper sheets, which are loaded on the paper sheetstack pad 100. The paper pressing member 112 presses down the uppermostpaper sheet of the paper stacking pad 100, so that the rotating force ofthe paper sheet feeding roller 111 can be properly transmitted to thepaper sheet.

The paper sheet separating roller 113 and the paper sheet separatingguide 114 act on the plurality of the paper sheets, in such a mannerthat the paper sheets can be separated one by one, and can be conveyedto the paper aligning unit 120.

In FIG. 2, a reference numeral 115 indicates an idle gear that connectsthe paper sheet-feeding roller 111 and the paper sheet-separating roller113 together. S1 indicates a paper sensor for sensing the presence ofthe paper sheets on the paper stack pad 100. For example, anon-contacting type sensor such as a photo-sensor or the like, or acontacting type sensor such as a solenoid-driven pivotal lever can beemployed.

The aligning unit 120 includes a back-up roller 122 and an aligningroller (or a registration roller) 121 disposed in parallel with eachother vertically for performing contacted revolutions.

The back-up roller 122 and an aligning roller 121 act on the papersheets which advance toward the image reading part 105, so as to controlthe conveying time. Thus, any skew advancement of the paper sheets canbe corrected, so that the paper sheets can be conveyed to the imagereading part 105 in an aligned manner.

In the drawing, reference symbols S2 and S3 indicate paper sheet sensorsthat are respectively installed upstream and downstream of the aligningunit 120. The sensor S2 senses the leading edge of the incoming papersheet to output signals for controlling the driving time of the aligningroller 121 and the back-up roller 122.

That is, the leading edge of the paper sheet is manipulated to form aloop in a state when the aligning roller 121 and the back-up roller 122are stopped. In this state, the sensor S2 outputs control signals todrive the aligning roller 121 and the back-up roller 122 with a timegap, so that any skew advancement of the paper sheets can be corrected.

Further, the sensor S3 senses the leading edge of the advancing papersheet after the skew has been corrected by the aligning roller 121 andthe back-up roller 122. Then the sensor S3 outputs control signals tomake the image reading region-starting point correspond to the imagereading starting time of the image reading part.

The paper sheet sensors S2 and S3 may consist of non-contacting typesensors such as photo sensors, or contacting type sensors such assolenoid-driven pivotal levers.

The image reading part 105 reads the image information of the papersheet and converts it to digital image information. The image readingpart 105 is upward biased by a spring 106 so as to form a nip between animage reading sensor (not illustrated) and a white bar 123.

The paper sheet ejecting unit 130 includes an ejecting roller 131 and aback-up roller 132 installed in a vertical relationship adjacent to eachother.

With additional reference to FIG. 3, the driving unit 190 interactivelyand selectively drives the paper sheet separating unit 113, the aligningroller 121 and the paper sheet-ejecting roller 131 in the arrow-markeddirection by using a single driving motor. The main portion of thedriving unit 190 is illustrated in FIG. 3.

The driving unit 190 includes a driving motor 140 controlled to bedriven in forward and reverse directions, and a power cleaving means 150(151, 152, 153) for selectively transmitting the rotational drivingforce to a first power transmitting system 160 (161, 162, 163, 164, 165,166), and to a second power transmitting system 170 (171, 173, 175,177).

The power cleaving system 150 includes a main gear 151 meshed with apinion 141. The pinion 141 is installed on the output shaft of thedriving motor 140, and first and second cam gears 152 and 153 arerespectively installed on both ends of the shaft of the main gear 151,for advancing and withdrawing in accordance with the forward and reversedriving modes of the driving motor 140.

FIG. 4 schematically illustrates the coupling between the main gear 151and the first and second cam gears 152 and 153. The first and second camgears 152 and 153 have tooth parts 152 a and 153 a formed on the frontends thereof in clockwise or anticlockwise direction, and cam curveparts 152 b and 153 b formed on the rear ends.

On the main gear 151, there project a pair of cam pins 151 a whichinteract with the cam curve parts 152 b and 153 b of the first andsecond cam gears 152 and 153 so as to perform a cam following.

Accordingly, the pair of cam pins 151 a respectively move along the camcurve parts 152 b and 153 b of the first and second cam gears 152 and153, with the result that the first and second cam gears 152 and 153advance and withdraw mutually, facingly along the axis of the main gear151.

The first power transmitting system 160 includes a first connection gear161, relay gears 162 and 163, and passive gears 164 and 165. The firstconnection gear 161 is selectively contacted to the first cam gear 152.

The passive gears 164 and 165 are respectively installed on therevolution shafts of the paper sheet separating roller 113 and the papersheet-ejecting roller 131, in such a manner that the passive gears 164and 165 are rotationally connected to the first connection gear 161.

The relay gears 162 and 163 are disposed between the first connectiongear 161 and the passive gears 164 and 165. The reference symbol 166indicates a clutch means for driving the driving roller 113uni-directionally.

The second power transmitting system 170 includes a second connectiongear 171, a connecting gear 173, and a power transmitting mechanism 180.

The second connection gear 171 is installed in such a manner as to beselectively connected by the second cam gear 153. The connecting gear173 is installed on the revolution shaft of the aligning roller 121 insuch a manner that the gear 173 is connected to the second connectiongear 171.

The first connection gear 161 and the second connection gear 171respectively have gear parts formed in a direction corresponding to thegear parts 152 a and 153 a, and thus to be meshed with the gear parts152 a and 153 a of the first and second cam gears 152 and 153.

The power transmitting mechanism 180 selectively connects the connectinggear 173 to the passive gear 165 that is installed on the revolutionshaft of the paper sheet-ejecting roller 131.

The power transmitting mechanism 180 includes a third cam gear 181installed on the shaft of a transmitting gear 177 to be moved in alinear direction, the transmitting gear 177 being connectable to theconnecting gear 173 of the aligning roller 121 by the relay gear 175.The power transmitting mechanism also includes a third connection gear182 installed on the revolution shaft of the paper sheet ejecting roller131 and installed coaxially with the passive gear 165, for beingselectively connected to the third cam gear 181 in accordance with themovements of the third cam gear 181.

The third cam gear 181 has a constitution which is the same as that ofthe first and second cam gears 152 and 153 of FIG. 4. The thirdconnection gear 182 has a gear part that can be meshed with the gearpart of the third cam gear 181.

FIG. 5 illustrates another embodiment of the above-described drivingunit. In this embodiment, the relay gear 175, which in FIG. 4 isdisposed between the connecting gear 173 of the aligning roller 121 andthe transmitting gear 177, is eliminated, and instead, is replaced withpulleys and a belt B.

The paper sheet conveying apparatus of an image information processoraccording to the present invention will now be described as to itsoperations referring to FIGS. 6 through 17.

Referring to FIGS. 6 through 8, if the driving mode is carried outthrough a control panel (not illustrated) of the image informationprocessor, the driving motor 140 revolves in the forward direction (inthe solid line arrow mark direction in FIG. 9). Therefore, the papersheet feeding roller 111 and the paper sheet separating roller 113 aredriven to separate one of the paper sheets of the paper stack pad 100 soas to convey the separated sheet toward the aligning roller 121. This isa paper sheet feeding step.

Meanwhile, in the paper sheet feeding step, the rotational driving forceof the driving motor 140 is transmitted through the power cleaving means150 to the paper sheet separating roller 113, and is also transmitted tothe paper sheet ejecting roller 131, so that the paper sheet ejectingroller 131 and the back-up roller 132 are subjected to idle revolutions.On the other hand, the paper sheet aligning roller 121 is prevented fromreceiving power from the driving motor 140 by the power cleaving means150, and therefore, remains at a stopped state.

As the feeding of the paper sheet is progressed in a state that theleading edge of the paper sheet is restricted by the aligning roller 121and the back-up roller 122 which are in a stationary state, as shown inFIG. 8, a loop of the paper sheet is formed.

Meanwhile, referring to FIG. 17, during the paper sheet feedingprocedure, the paper sheet sensor S2 senses the leading edge of thepaper sheet and outputs a signal. By the signal, the aligning roller 121and the back-up roller 122 are controlled to be in the stationary statefor a predetermined extended time, and thus, the advancement of thepaper sheet is delayed for the predetermined time, so that the leadingedge of the paper sheet can be aligned from any skew.

Under this condition, the paper sheet separating roller 113 is rotatedby the driving motor 140 until the loop of the paper sheet disappears.Then after the disappearance of the loop of the paper sheet, and thepredetermined extended time has passed, the second power transmittingsystem is driven and the linear velocity of the aligning roller 121becomes faster than the linear velocity of the paper sheet separatingroller 113, and therefore, the paper sheet-separating roller 113 canperform idle revolutions depending on the conveying velocity of thealigning roller 121.

FIG. 9 illustrates the operation of the driving unit 190 during thepaper sheet feeding step. The rotational force of the driving motor 140drives the paper sheet separating roller 113 and the paper sheetejecting roller 131 by the function of the power cleaving means 150.

FIG. 10 illustrates the operations of the power cleaving means 150during the paper sheet feeding step. The first cam gear 152 of the maingear 151 is connected to the first connection gear 161 in accordancewith the forward revolutions of the driving motor 140.

Accordingly, the first connection gear 161 drives the paper sheetseparating roller 113 through the relay gear 162 and the passive gear166, and drives the paper sheet-ejecting roller 131 through the relaygear 163 and the passive gear 165.

Meanwhile, when the paper sheet 101 is temporarily stopped by beingrestricted by the aligning roller 121 and the back-up roller 122, and ifa certain time period has elapsed, then the driving motor 140 is shiftedto a reverse revolution mode (as shown by the dotted-line arrow marks inFIGS. 14A and 14B) so as to enter into an image reading step and a papersheet ejecting step.

During the reverse driving of the driving motor 140, the aligning roller121 starts to revolve as shown in FIG. 11. Then the paper sheet 101 ismade to advance to the image reading part 105 as shown in FIG. 12, andafter the reading of the images, the paper sheet is ejected to theoutside by the driving forces of the paper sheet ejecting roller 131 andthe back-up roller 132.

Referring to FIG. 17, during the conveying of the paper sheet asdescribed above, the paper sensor S3 senses the leading edge of thepaper sheet which has been corrected as to its skew by the aligningroller 121 and the back-up roller 122, and the paper sensor S3 outputscontrol signals to make the image reading starting point correspond tothe image reading starting time of the image reading part 105.

FIGS. 14A and 14B illustrate the operations of the driving unit 190 inthe image reading step and the paper sheet ejecting step. First, asshown in FIG. 14a, the rotating force of the driving motor 140 istransmitted through the power cleaving means 150 and through the secondconnection gear 171 and the connecting gear 173 to the aligning roller121 to drive the aligning roller 121.

At the same time, the power that has been transmitted to the connectinggear 173 is further transmitted through the directions of arrows A and Bto the paper sheet ejecting roller 131. That is, the power istransmitted through the connecting gear 173, the relay gear 175, thetransmitting gear 177 and the power transmitting mechanism 180 to thepaper sheet ejecting roller 131 to drive the paper sheet ejecting roller131 in the forward revolution mode.

FIG. 15 illustrates the action of the power cleaving means 150 duringthe reverse evolution mode. Here, the power cleaving means 150 acts in amanner opposite to the forward revolution mode of FIG. 10.

That is, in accordance with the reverse revolutions of the driving motor140, the second cam gear 153 of the main gear 151 is connected to thesecond connection gear 171, with the result that the connecting gear173, the relay gear 175 and the transmitting gear 177 are driven.

FIG. 16 illustrates the operation of the power transmitting mechanism180 in the reverse revolution mode of the driving motor 140. Here, thethird cam gear 181 of the transmitting gear 177 is connected to thethird connection gear 182, and therefore, the paper sheet ejectingroller 131 is driven through the passive gear 165 that is connected tothe third connection gear 182.

Accordingly, the paper sheet separating roller 113 is driven in the samedirection as that in the forward revolution mode of the driving motor,because the power, which has been transmitted through the passive gear165, the relay gear 163, the first connection gear 161 and the relaygear 162, is controlled to act as a uni-directional rotating force.

The above described paper sheet conveying procedure is repeatedlycarried out to eject the paper sheets repeatedly.

According to the present invention as described above, the conventionalcomplicated and time-consuming mechanism which requires high precisionis not employed, but instead a simple gear train is adopted, so that thepaper aligning and the skew correction can be realized in a simple andsure manner, thereby upgrading the reliability even when automaticfeeding.

Further, the paper sheet-ejecting roller is additionally provided, sothat the paper ejection can be efficiently carried out even on a largeamount of stacked paper, and the ejected paper sheets can be neatlystacked. Particularly, in the present invention, even in the case wherethe whole paper-advancing path from the paper insertion part to thepaper ejecting part has a horizontal contour, the paper ejection can beefficiently carried out.

In the above, the present invention was described based on the specificpreferred embodiments and the attached drawings, but it should beapparent to those ordinarily skilled in the art that various changes andmodifications can be added without departing from the spirit and scopeof the present invention, which will be defined in the appended claims.

What is claimed is:
 1. A paper sheet conveying apparatus of an imageinformation processor, comprising: a driving unit which interactivelyand selectively drives a paper sheet separating roller, a paper sheetaligning roller and a paper sheet ejecting roller at different conveyingstages, the paper sheet separating roller, the paper sheet aligningroller and the paper sheet ejecting roller are sequentially disposed foruni-directionally conveying an image-recorded paper sheet, the drivingunit includes: a driving motor which is mode-shiftably driven in aforward mode direction and a reverse mode direction; a power cleavingmechanism which selects a direction of a rotational driving force sothat the driving force is transmitted through different paths inaccordance with the driving modes; a first power transmitting systemwhich drives the paper sheet separating roller and the paper sheetejecting roller to correspond with a conveying direction, by beingselectively connected to the power cleaving mechanism; and a secondpower transmitting system which drives the paper sheet separatingroller, the paper sheet aligning roller and the paper sheet ejectingroller in the conveying direction by being selectively connected to thepower cleaving mechanism.
 2. The paper sheet conveying apparatus asclaimed in claim 1, wherein the power cleaving mechanism comprises: amain gear connected to an output shaft of the driving motor; and a firstcam gear and a second cam gear respectively installed on ends of theoutput shaft of the main gear to be moved in a linear direction, foradvancing and withdrawing mutually along an axis of the main gear inaccordance with the forward and reverse mode directions of the drivingmotor.
 3. The paper sheet conveying apparatus as claimed in claim 1,wherein the first power transmitting system comprises: a firstconnection gear which is selectively connected in accordance with thelinear movements of the first cam gear; and a first passive gearinstalled on a shaft of the paper sheet separating roller and a secondpassive gear installed on a shaft of the paper sheet ejecting roller sothat the first and second passive gears are connected to the firstconnection gear.
 4. The paper sheet conveying apparatus as claimed inclaim 3, further comprising a first relay gear disposed between thefirst connection gear and the first passive gear, and a second relaygear disposed between the first connection gear and the second passivegear.
 5. The paper sheet conveying apparatus as claimed in claim 1,wherein the second power transmitting system comprises: a secondconnection gear which is selectively connected to the second cam gear; aconnecting gear installed on a shaft of the paper sheet aligning roller,the connecting gear connected to the second connection gear; and a powertransmitting means for selectively connecting to a passive gear of thepaper sheet-ejecting roller.
 6. A paper sheet conveying apparatus of animage information processor, comprising: means for interactively andselectively driving a paper sheet separating roller, a paper sheetaligning roller and a paper sheet ejecting roller at different conveyingstages, the paper sheet separating roller, the paper sheet aligningroller and the paper sheet ejecting roller being sequentially disposedfor uni-directionally conveying a paper sheet having a recorded image,the means for interactively and selectively driving includes, a drivingmotor for being mode-shiftably driven in a forward mode direction and areverse mode direction; a power cleaving means for selecting a directionof a rotational driving force so that the driving force is transmittedthrough different paths in accordance with the driving modes; means fordriving the paper sheet separating roller and the paper sheet ejectingroller to correspond with a conveying direction, by being selectivelyconnected to the power cleaving means when the driving motor is drivenin one of the forward and reverse mode directions; and means for drivingthe paper sheet separating roller, the paper sheet aligning roller andthe paper sheet ejecting roller in the conveying direction by beingselectively connected to the power cleaving means when the driving motoris driven in another of the one of the forward and reverse modedirections.